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Molecular confirmation of resistance to PPO inhibitors in Amaranthus tuberculatus and Amaranthus palmeri, and isolation of the G399A PPO2 substitution in A. palmeri

Published online by Cambridge University Press:  18 August 2020

Jacob S. Montgomery ,
Darci A. Giacomini  and
Patrick J. Tranel Open the ORCID record for Patrick J. Tranel [Opens in a new window]
Jacob S. Montgomery
Affiliation:
Graduate Student, University of Illinois, Urbana, IL, USA
Darci A. Giacomini
Affiliation:
Research Assistant Professor, University of Illinois, Urbana, IL, USA
Patrick J. Tranel*
Affiliation:
Professor, University of Illinois, Urbana, IL, USA
*
Author for correspondence: Patrick J. Tranel, 1201 W Gregory Drive, University of Illinois, Urbana, IL61801. Email: tranel@illinois.edu
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Abstract

During the 2017 to 2019 growing seasons, samples of waterhemp and Palmer amaranth that had reportedly survived field-rate applications of protoporphyrinogen oxidase (PPO)–inhibiting herbicides were collected from the American Midwest and tested for target-site mutations known at the time to confer resistance. Target-site resistance was identified in nearly all (135 of 145) tested common waterhemp populations but in only 8 of 13 Palmer amaranth populations. Follow-up research on one population of Palmer amaranth (W-8), which tested negative for all such mutations, confirmed it was resistant to lactofen, with a magnitude of resistance comparable to that conferred by the ΔG210 PPO2 mutation. Gene sequences from both isoforms of PPO (PPO1 and PPO2) were compared between W-8 and known PPO inhibitor–sensitive sequence. A glycine-to-alanine substitution at the 399th amino acid position (G399A) of PPO2, recently identified to reduce target-site herbicide sensitivity, was observed in a subset of resistant W-8 plants. Because no missense mutation completely delimited resistant and sensitive sequences, we initially suspected the presence of a secondary, non-target-site resistance mechanism in this population. To isolate G399A, a segregating F2 population was produced and screened with a delimiting rate of lactofen. χ2 goodness-of-fit analysis of dead/alive ratings indicated single-locus inheritance of resistance in the F2 population, and molecular markers for the W-8 parental PPO2 coding region co-segregated tightly, but not perfectly, with resistance. More research is needed to fully characterize Palmer amaranth PPO inhibitor–resistance mechanisms, which appear to be more diverse than those found in common waterhemp.

Keywords

Target-site resistancePPO1PPO-inhibiting herbicidesallele-specific markersLactofencommon waterhempAmaranthus tuberculatus (Moq.) J.D. SauerPalmer amaranthAmaranthus palmeri S. Watson
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 1 , February 2021 , pp. 99 - 105
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of Weed Science Society of America

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Footnotes

Associate Editor: R. Joseph Wuerffel, Syngenta

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